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When a person works out to gain muscle are they adding more muscle fibers?
No, the number of fibers remains constant. The size of the fibers increases.
Why do slow twitch muscle fibers have more mitochondria compared to fast twitch muscle fibers?
Slow twitch muscle fibers have more mitochondria compared to fast twitch muscle fibers because they rely more on aerobic metabolism for energy production, which requires a higher number of mitochondria to generate ATP efficiently.
How muscular system can grow strong?
Through use. The current thought is that using a muscle to fatigue creates little tears in the muscle fibers, that then heal over a few days, creating more muscle fibers, and more fibers means more strength.
What happens to a muscle in the body when it gets longer?
You get stronger. The individual muscle fibers become thicker with more myofibrils inside them. The number of muscle cells stays the same, contrary to popular belief that you grow more muscle fibers, this is not true.
Which muscle fibers are best suited for running a marathon?
Type I (red) muscle fibers, which have slow oxidative characteristics, are those primarily called on for long-distance running. These are more commonly referred to as 'slow-twitch' muscle fibers.
Why do slow twitch muscle fibers have more mitochondria than fast twitch muscle fibers?
Slow twitch muscle fibers have more mitochondria than fast twitch muscle fibers because they rely more on aerobic metabolism to produce energy for sustained, endurance activities. Mitochondria are the powerhouse of the cell and are responsible for producing energy in the form of ATP through aerobic respiration. Since slow twitch fibers require more sustained energy production, they have more mitochondria to support this process compared to fast twitch fibers, which rely more on anaerobic metabolism for quick bursts of energy.
What motor unit has the fewest muscle fibers?
One that isn't needed for precise movement. Muscles that need precise control have motor units with more muscle fibers.
How can exercise change muscle strength?
Muscle strength depends on the thickness of the fibers and the number of fibers contract at one time. And in order to compensate for the added work load,myofibrils are added in in order to increase the thickness of the fibers (more myofibrils,more thickness), hence a stronger muscle.
Does increased muscle density mean more myofibrils per muscle fiber?
Yes, it means that you will gain more myofibrils per muscle fiber. A muscle fiber is a muscle cell, and everybody has about the same number. When you train your muscles, they will develop more myofibrils inside the muscle cells. So you cannot change the number of muscle fibers, or cells, but you can change the number of fibers, or myofibrils, inside them. The end result is more muscle density, not more muscle cells.
What type of fibers are present in supraspinatus and infraspinatus muscles?
The supraspinatus muscle contains mostly type I (slow-twitch) muscle fibers, which are more fatigue-resistant and used for sustained contractions. The infraspinatus muscle contains a mix of type I and type II (fast-twitch) muscle fibers, which are used for more powerful and quick contractions.
What type of muscle fibers are found in higher proportion in weight lifters?
Type II (fast-twitch) muscle fibers are found in higher proportion in weight lifters. These fibers generate more force and are associated with explosive movements and short bursts of intense activity.
What is a pennate muscle?
Pennate MusclesIn a pennate muscle, the fascicles form a common angle with the tendon. Because the muscle cells pull at an angle, contracting pennate muscles do not move their tendons as far as parallel muscles do. But a pennate muscle contains more muscle fibers--and, as a result, produces more tension--than does a parallel muscle of the same size. (Tension production is proportional to the number of contracting sarcomeres; the more muscle fibers, the more myofibrils and sarcomeres.)
